Rockwell Automation 1760-xxxx Pico Controller User Manual - Manual (Page 66)

Publication 1760-UM001D-EN-P - September 2005
4-6 Draw a Circuit Diagram with Pico
The switching behavior of these relays is set using coil functions and
parameters. The coil functions and parameters are listed with the
description of each function relay type.
The options for setting output and marker relays are listed with the
description of each coil function.
Circuit Diagram Display
In the circuit diagram, contacts and coils are connected from left to
right - from contact to coil. The circuit diagram is created on a hidden
grid containing contact fields, coil fields and circuit connections. It is
then wired with connections.
Insert relay contacts in the three contact fields. The first contact field is
automatically connected to the voltage.
Insert the relay coil to be controlled together with its function and
designation in the coil field.
Every line in the circuit diagram forms a circuit connection or ladder
logic rung. Pico enables 128 circuit connections/rungs.
Connections are used to produce the electrical continuity between
relay contacts and the coil. Connections can be created across several
rungs. Each point of intersection is a connection. The circuit diagram
display performs two functions:
• In Stop mode, it is used to edit the circuit diagram.
• In Run mode, it is used to check the circuit diagram using the
Power flow display.
I1 -I2 -T1 -{Q1
Q1 - 1
Coil Field Contact Fields
Connections
Circuit
connections/rungs